printf %T: Fix "th" as ordinal specifier (re: 1a9d8ad) (#734)

Reproducers:

    $ printf '%(%F)T\n' '4th tuesday in march 2016'
    2016-04-09
    $ printf '%(%F)T\n' '4nd tuesday in march 2016'
    2016-03-08

Expected, in both cases: 2016-03-22

It was a left over, while I reworked these things some time ago, I
normalised the 'f' variable usage (specially the +1 -1 usage), and
the cryptic TM_ORDINAL case was kinda magical and I left it
untouched.

Now thanx @stephane-chazelas, I got a test case and can understand
it. I added a test case to catch any regression in this area if one
try to make printf better :-)

src/lib/libast/tm/tmxdate.c:
- tmxdate(): While normalising the 'f' variable usage into
  tmxdate(), also handle the TM_ORDINAL case, which had been
  overlooked.

Thanks to @stephane-chazelas for the bug report.
Resolves: #733

NEWS

@@ -2,6 +2,14 @@ This documents significant changes in the dev branch of ksh 93u+m.
 For full details, see the git log at: https://github.com/ksh93/ksh
 Uppercase BUG_* IDs are shell bug IDs as used by the Modernish shell library.
 
+2024-03-30:
+
+- A regression was fixed in ordinal specifiers in 'printf %T' date
+  specifications. For example,
+	printf '%(%F)T\n' '4th tuesday in march 2016'
+  wrongly printed '2016-04-09' and now again correctly prints '2016-03-22'.
+  This regression was introduded with the printf fixes on 2023-05-18.
+
 2024-03-24:
 
 - We now support building a dynamically linked ksh 93u+m with libast,

src/cmd/ksh93/include/version.h

@@ -18,7 +18,7 @@
 
 #define SH_RELEASE_FORK	"93u+m"		/* only change if you develop a new ksh93 fork */
 #define SH_RELEASE_SVER	"1.1.0-alpha"	/* semantic version number: https://semver.org */
-#define SH_RELEASE_DATE	"2024-03-24"	/* must be in this format for $((.sh.version)) */
+#define SH_RELEASE_DATE	"2024-03-30"	/* must be in this format for $((.sh.version)) */
 #define SH_RELEASE_CPYR	"(c) 2020-2024 Contributors to ksh " SH_RELEASE_FORK
 
 /* Scripts sometimes field-split ${.sh.version}, so don't change amount of whitespace. */

src/cmd/ksh93/tests/printf.sh

@@ -285,6 +285,24 @@ T '2020-2-3 12:34:56 next fri'		'2020-02-14 12:34:56'
 T '2020-2-3T12:34:56Z'			'2020-02-03 12:34:56'
 T '2020-2-3 12:34:56Z'			'2020-02-03 12:34:56'
 
+C='Ordinal access'
+format='%F'
+T '1th tuesday in 2016-3'		'2016-03-01'
+T '2th tuesday in 2016-3'		'2016-03-08'
+T '3th tuesday in 2016-3'		'2016-03-15'
+T '4th tuesday in 2016-3'		'2016-03-22'
+T '5th tuesday in 2016-3'		'2016-03-29'
+T 'first tuesday in march 2016'		'2016-03-01'
+T 'second tuesday in march 2016'	'2016-03-08'
+T 'third tuesday in march 2016'		'2016-03-15'
+T 'fourth tuesday in march 2016'	'2016-03-22'
+T 'fifth tuesday in march 2016'		'2016-03-29'
+T '1st tuesday in march 2016'		'2016-03-01'
+T '2nd tuesday in march 2016'		'2016-03-08'
+T '3rd tuesday in march 2016'		'2016-03-15'
+T '4th tuesday in march 2016'		'2016-03-22'
+T '5th tuesday in march 2016'		'2016-03-29'
+
 # The following tests for times relative to the current time require GNU 'date' to compare our results to.
 if	! gd=$(	set -o noglob
 		IFS=:

src/lib/libast/tm/tmxdate.c

@@ -805,7 +805,7 @@ tmxdate(const char* s, char** e, Time_t now)
 					break;
 				goto save;
 			}
-			else if (f == -1 && isalpha(*t) && tmlex(t, &t, tm_info.format + TM_ORDINAL, TM_ORDINALS - TM_ORDINAL, NULL, 0) >= 0)
+			else if ((f == -1 || f == 1) && isalpha(*t) && tmlex(t, &t, tm_info.format + TM_ORDINAL, TM_ORDINALS - TM_ORDINAL, NULL, 0) >= 0)
 			{
 				message((-1, "AHA#%d n=%d", __LINE__, n));
  ordinal: